other conditions. But when mood changes appear with fatigue, tingling, balance problems, or memory issues, B12 should be considered.
7. Sore Tongue or Mouth Problems
A sore, red, swollen, or smooth-looking tongue can be a sign of vitamin B12 deficiency. Some people also notice mouth ulcers, burning sensations, or discomfort while eating.
The NIH Office of Dietary Supplements includes soreness of the mouth or tongue among possible symptoms of vitamin B12 deficiency.
Mouth symptoms can also come from infections, irritation, dental problems, folate deficiency, iron deficiency, or other nutritional issues.
